stress level or levels?

[Unregistered]

hi there,
Please proofread the following sentence:

Many people work out in order to cut down their stress level OR levels more quickly.

pete

[Soup]

1. their stress level <common collocation>
2. their level of stress

People can also have different levels of stress, depending on the situation; e.g., home, work, etc.

3. their stress levels
4. their levels of stress